Gneiss Rocks found at Ceann an Eanaigh (Annagh Head), a Wild Atlantic Way discovery point, are the oldest rocks on mainland Ireland. The gneiss here are 1,753 million years old!
Gneiss is a high grade metamorphic rock, meaning that it has been subjected to higher temperatures and pressures than schist. It is formed by the metamorphosis of granite, or sedimentary rock.
Belmullet, Co. Mayo
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